Then it might be time to read the user manual and see what recovery options your PC came with. In older Windows versions It's not unusual they are hidden under some key you have to press before Windows is started.
It's also possible to make your own repair disk or stick on some other PC with the same OS.
Windows isn't responding when I start up my computer. When I get to the boot manager, I hit many of the options and nothing happens. This started when I was starting up a continued save of a New Vegas copy I got from Steam. Anybody know what I can do to get it working? I'm not that computer savy, I don't have an installation disc or a recovery disc, it's so frustrating.